CVE-2026-31637

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-04-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In the Linux kernel, the following vulnerability has been resolved:

rxrpc: reject undecryptable rxkad response tickets

rxkad_decrypt_ticket() decrypts the RXKAD response ticket and then parses the buffer as plaintext without checking whether crypto_skcipher_decrypt() succeeded.

A malformed RESPONSE can therefore use a non-block-aligned ticket length, make the decrypt operation fail, and still drive the ticket parser with attacker-controlled bytes.

Check the decrypt result and abort the connection with RXKADBADTICKET when ticket decryption fails.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
40.3%
KEV
Not listed

Published

April 24, 2026

Last Modified

June 1, 2026

Advisory Details (8)

Auto-updated Jun 20, 2026
No patch confirmed yet.
generic

rxrpc: reject undecryptable rxkad response tickets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fe4447cd95623b1cfacc15f280aab73a6d7340b2
generic

rxrpc: reject undecryptable rxkad response tickets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b3a808cd0790b5075aaa2bc3588edf02cd71d352
generic

rxrpc: reject undecryptable rxkad response tickets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a75b3b361dd481d942c5f259a82d59718a41092c
generic

rxrpc: reject undecryptable rxkad response tickets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a149dcae23309df9de1c3b6b5d468610ef5ab7de
generic

rxrpc: reject undecryptable rxkad response tickets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/58fcd1b156152613ba00a064a129fb69507ddd7d
generic

rxrpc: reject undecryptable rxkad response tickets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8a
generic

rxrpc: reject undecryptable rxkad response tickets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/252157d939d179b5d767cb860ff8fa7f8723b67a
generic

rxrpc: reject undecryptable rxkad response tickets - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/22f6258e7b31dba9bf88dce4e3ee7f0f20072e60

Vendor Advisories for CVE-2026-31637(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 10× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 296 total refreshes for this CVE.

  1. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 02:00 UTCEPSS rescore
  4. 2026-07-15 02:00 UTCEPSS rescore
  5. 2026-07-13 22:30 UTCEPSS rescore
  6. 2026-07-13 06:13 UTCEPSS rescore
  7. 2026-07-13 06:13 UTCEPSS rescore
  8. 2026-07-12 05:46 UTCEPSS rescore
  9. 2026-07-11 08:27 UTCEPSS rescore
  10. 2026-07-09 19:10 UTCEPSS rescore
  11. 2026-07-08 15:15 UTCEPSS rescore
  12. 2026-07-07 13:46 UTCEPSS rescore
  13. 2026-07-06 16:27 UTCEPSS rescore
  14. 2026-07-06 16:27 UTCEPSS rescore
  15. 2026-07-06 02:23 UTCEPSS rescore
  16. 2026-07-06 02:23 UTCEPSS rescore
  17. 2026-07-05 02:30 UTCEPSS rescore
  18. 2026-07-04 06:31 UTCEPSS rescore
  19. 2026-07-01 15:06 UTCEPSS rescore
  20. 2026-06-30 23:22 UTCEPSS rescore
  21. 2026-06-29 14:06 UTCEPSS rescore
  22. 2026-06-29 14:06 UTCEPSS rescore
  23. 2026-06-28 14:07 UTCEPSS rescore
  24. 2026-06-28 14:07 UTCEPSS rescore
  25. 2026-06-28 04:56 UTCEPSS rescore
Show 75 more
  1. 2026-06-28 04:56 UTCEPSS rescore
  2. 2026-06-27 03:08 UTCEPSS rescore
  3. 2026-06-25 13:49 UTCEPSS rescore
  4. 2026-06-25 13:49 UTCEPSS rescore
  5. 2026-06-24 14:05 UTCEPSS rescore
  6. 2026-06-23 21:33 UTCEPSS rescore
  7. 2026-06-23 21:33 UTCEPSS rescore
  8. 2026-06-22 14:25 UTCEPSS rescore
  9. 2026-06-22 14:25 UTCEPSS rescore
  10. 2026-06-21 14:56 UTCEPSS rescore
  11. 2026-06-21 14:56 UTCEPSS rescore
  12. 2026-06-21 01:59 UTCEPSS rescore
  13. 2026-06-19 19:25 UTCEPSS rescore
  14. 2026-06-19 19:25 UTCEPSS rescore
  15. 2026-06-18 17:52 UTCEPSS rescore
  16. 2026-06-18 17:52 UTCEPSS rescore
  17. 2026-06-17 17:53 UTCEPSS rescore
  18. 2026-06-16 17:52 UTCEPSS rescore
  19. 2026-06-15 17:49 UTCEPSS rescore
  20. 2026-06-15 06:36 UTCEG score recompute
  21. 2026-06-15 06:36 UTCVendor advisory
  22. 2026-06-15 06:36 UTCGHSA enrichment
  23. 2026-06-15 02:06 UTCEG score recompute
  24. 2026-06-15 02:06 UTCVendor advisory
  25. 2026-06-15 02:06 UTCGHSA enrichment
  26. 2026-06-14 23:18 UTCEPSS rescore
  27. 2026-06-14 20:55 UTCEG score recompute
  28. 2026-06-14 20:55 UTCVendor advisory
  29. 2026-06-14 20:55 UTCGHSA enrichment
  30. 2026-06-14 16:38 UTCEG score recompute
  31. 2026-06-14 16:38 UTCVendor advisory
  32. 2026-06-14 16:38 UTCGHSA enrichment
  33. 2026-06-14 11:51 UTCEG score recompute
  34. 2026-06-14 11:51 UTCVendor advisory
  35. 2026-06-14 11:51 UTCGHSA enrichment
  36. 2026-06-13 23:00 UTCEPSS rescore
  37. 2026-06-12 23:12 UTCEPSS rescore
  38. 2026-06-12 23:12 UTCEPSS rescore
  39. 2026-06-12 12:20 UTCEG score recompute
  40. 2026-06-12 12:20 UTCVendor advisory
  41. 2026-06-12 12:20 UTCGHSA enrichment
  42. 2026-06-12 07:37 UTCEG score recompute
  43. 2026-06-12 07:37 UTCVendor advisory
  44. 2026-06-12 07:37 UTCGHSA enrichment
  45. 2026-06-12 02:59 UTCEG score recompute
  46. 2026-06-12 02:59 UTCVendor advisory
  47. 2026-06-12 02:59 UTCGHSA enrichment
  48. 2026-06-11 22:44 UTCEG score recompute
  49. 2026-06-11 22:44 UTCGHSA enrichment
  50. 2026-06-11 18:30 UTCEG score recompute
  51. 2026-06-11 18:30 UTCVendor advisory
  52. 2026-06-11 18:29 UTCGHSA enrichment
  53. 2026-06-11 14:00 UTCEPSS rescore
  54. 2026-06-11 13:55 UTCEG score recompute
  55. 2026-06-11 13:55 UTCVendor advisory
  56. 2026-06-11 13:55 UTCGHSA enrichment
  57. 2026-06-10 22:18 UTCEPSS rescore
  58. 2026-06-10 21:01 UTCEG score recompute
  59. 2026-06-10 21:01 UTCVendor advisory
  60. 2026-06-10 21:01 UTCGHSA enrichment
  61. 2026-06-10 16:47 UTCEG score recompute
  62. 2026-06-10 16:47 UTCVendor advisory
  63. 2026-06-10 16:47 UTCGHSA enrichment
  64. 2026-06-10 13:22 UTCEPSS rescore
  65. 2026-06-10 12:33 UTCEG score recompute
  66. 2026-06-10 12:33 UTCVendor advisory
  67. 2026-06-10 12:33 UTCGHSA enrichment
  68. 2026-06-10 08:19 UTCEG score recompute
  69. 2026-06-10 08:19 UTCVendor advisory
  70. 2026-06-10 08:19 UTCGHSA enrichment
  71. 2026-06-10 04:05 UTCEG score recompute
  72. 2026-06-10 04:05 UTCVendor advisory
  73. 2026-06-10 04:05 UTCGHSA enrichment
  74. 2026-06-09 23:51 UTCEG score recompute
  75. 2026-06-09 23:51 UTCVendor advisory

Frequently asked(5)

What is CVE-2026-31637?
CVE-2026-31637 is a critical vulnerability published on April 24, 2026. In the Linux kernel, the following vulnerability has been resolved: rxrpc: reject undecryptable rxkad response tickets rxkaddecryptticket() decrypts the RXKAD response ticket and then parses the buffer as plaintext without checking whether cryptoskcipherdecrypt() succeeded. A malformed RESPONSE can…
When was CVE-2026-31637 disclosed?
CVE-2026-31637 was first published in the National Vulnerability Database on April 24, 2026, with the most recent update on June 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-31637 actively exploited?
CVE-2026-31637 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 40.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-31637?
CVE-2026-31637 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-31637?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-31637, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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